IMC recovery(20240322)
- Suspensions(R.Takahashi)
- Mechanical Motion
- Smooth pico motion and its default position
MCi/o: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28907 -> A.I. upload pitch pico pictures (R.Takahashi), or taking picture for pitch pico. -> https://klog.icrr.u-tokyo.ac.jp/osl/?r=28941
MCe: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28909 -> A.I. upload pitch, yaw pico pictures (R.Takahashi), or taking picture for pitch, yaw pico. -> https://klog.icrr.u-tokyo.ac.jp/osl/?r=28941
Gaps between magnets and coils -> MCo upper is the minimum, but this is the best effort.
Gaps between EQ stoppers and mirrors -> confirmed less than 1mm.
- Smooth pico motion and its default position
- Electrical wirings
Coil resistances and inductances -> A.I. Inductances should refer the past data if the coil did not change, or it will be measured again (Wasimi, 3/24(Monday morning)
MCo: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28668 -> A.I. MCo H4 looks high, it could be disconnection. It should be measured again (Wasimi, 3/24(Monday morning).
MCi/e: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28696 -> One of the MCi resistances is low, but low may have no problem. If it is high, it may have some disconnection.
Isolation of Wiring from coils to flanges(pico and mag-coil) -> MCi could not be accessed.
MCo: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28911 -> improved
MCe: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28910 -> improved
POM: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28914 -> This does not matter for the suspension.
- Fixing on tables is tight and reliable?
- Smooth Mag-coil motion and balance and TFs
- balance can be adjusted after closing?
MCe: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28940 -> A.I. Peak of pitch-shifted to higher frequency from the result of Feb.2. Needs remote centering for the Oplev first (Ushiba).
- Mechanical Motion
- Mirror conditions(Y.Aso)
- Clean around the center?
- MCe has a spot near the center. But its influence is expected to be small.
Inspection: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28856
- Clean around the center?
- Alignment(T.Akutsu, T.Ushiba, T.Yokozawa)
- TEM00 flashing
- The IMC trans beam is the same as before?
- Beam positions on each mirror
- They should be the same because the IMC trans was recovered in MCio?
- How about on MCe? MCE tra QPD can be the reference.
- QPD path and centering
- Gaps between magnets and coils again
- IP1/2 dynamic range check for the IMC injection?
- Beam paths for IMC REFL.
- Beam dump(T.Akutsu)
- Beam shield reinstallation
- Beam dumps were additionally added?
In basic, No. Relocation was done. https://klog.icrr.u-tokyo.ac.jp/osl/?r=28931 -> Inside of beam duct between PSL and iMC looks shining.
- Vacuum, etc (N.Kimura, T.Uchiyama, S.Miyoki)
- Cleaning
No dust inside, especially on the bottom? -> A.I. before closing.
Leak point was fastened tightly? -> A.I. when closing.
- It will be done when the bellows are attached by Mirapro.
MCE trans flange rotation (the past activity is in https://klog.icrr.u-tokyo.ac.jp/osl/?r=28326) -> it will be done on Mon.
Lift-up tool check for bellows installation. (past accident https://klog.icrr.u-tokyo.ac.jp/osl/?r=28344)
- Flange surface check to avoid leaking especially on GV_mcf
FFU stop for the MCE/MCREFL optical table and reconstruction of the window shield (MCE, MCF?). -> measurement of length of legs.
- Cleaning
one of templates for IMC closing by Akutsu-kun in 2021.
Summary
- TF of MCe had a shift of peak frequency on the pitch. Ushiba-kun will measure it again with the well-centered oplev. It will be reported at the recovery meeting or later.
- All others should be OK for closing IMC chambers.
- The resistance of the Coil of MCo H4 looked high. Washimi-kun will measure it again on Monday, but it won't stop closing anyway.
- Washimi-kun will measure inductances again on Monday.
- Check no dust inside, especially on the bottom before closing.
- Check the leak points are fastened tightly when closing.
X-Pcal Recovery(20240402)
- Path2 drift is concerns. However, we expect we can compensate for the drift by using pico-mirrors.
5% power loss is concerned. It should be checked on 3~4 April. --> klog#29065
Pcal-X noise in the Cal line is OK? --> klog#29075
EXC Recovery(20240404)
- Suspension health check (Takahashi, Ushiba)
- A01: Cable check
https://klog.icrr.u-tokyo.ac.jp/osl/?r=28840 -> please update.
- Other data are expected to be normal.
- A02 Porality Check
- impossible to change. so no problem.
- Cable disconnection happened, but they were recovered.
- Replaced magnets was checked by TF etc.
- A03 Rubbing Check
- ttps://klog.icrr.u-tokyo.ac.jp/osl/?r=29100
- A04: Range and Calibration
- The stepper motor range was checked.
- Calibration will be the same.
- A05: Watchdog Setting: Skip
- A06: Height Measurement
- Setpoint change after the height setting. So the height could be changed.
- If we believe LVDT values, we believe the height would not change in the orders of mm.
A08: Calibration:skip
- A09: Spectrum(spectra of IM/MN photosensors.)
- A10: Transfer Function
OK as modeling: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29100, https://klog.icrr.u-tokyo.ac.jp/osl/?r=29106
Phase delay in R -> R, but no such delay in other DoFs. The data in the air tends to have such phase delay in the DoFs. No influence on IFO/Sensitivity.
BF resonance has changed from 0.3 to 0.6Hz. Assuming this changes, the TF can be explained. https://klog.icrr.u-tokyo.ac.jp/osl/?r=28990, https://klog.icrr.u-tokyo.ac.jp/osl/?r=29106
- We need change the filter shape according to these changes. UGF was set around 0.01Hz. So a fine tune is necessary.
- A01: Cable check
- Oplev Check (Yokozawa, Akutsu)
- TM: Easy to find. SI should be cared. Will be don in Monday.
- PF: Easy to find. SI should be cared. Will be don in Monday.
- Green flash at REFL and Trans PD
- REFL: OK
- TMSX: No beam on PD. will be done on Monday. No CCD and PD at present.
- Flash can be seen in Tcam.
- X-Pcal homeworks
The spec loss at PBS can be comparable with the mysterious loss: Loss of power of ~ 5%: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29081
Cleaning inside was done: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29091
- Windows Cleaning
- Blanck ports:
Tcam (Yokozawa and ChenDan, and Yamamoto)
- TMSX optical system (Akutsu and his selected persons)
- Baffle PDs (Yokozawa and his selected persons)
- NAB, WAB (Akutsu)
- Vacuum system (Kimura-san / Uchiyama-kun and their selected persons)
- tie rods adjustment between EXC and TMSX to avoid stress when the only EXC side is pumped down.
- Replaced flange
- Cryo-system (Kimura-san and his selected persons)
- All temp signals are obtained?
*** Recovery(202404??)
*** Recovery(202404??)